Three star-shaped small molecular donors of TOBTC, TOBTC-1F and TOBTC-2F were developed, which adopt tris(2-methoxyphenyl)amine (TPA-OMe) as electron-donating core, as well as nonfluoro-, monofluoro- and difluoro-substituted benzo-thiadiazole as electron-withdrawing branch, respectively. The improved solubility and hole mobility were obtained in comparison to their analogues using TPA as core. More interestingly, the TOBTC-2F:PC₇₁BM blend exhibited highest hole mobility (μ_h) of 8.5 × 10⁻⁴ cm²V⁻¹s⁻¹ and its solution-processed organic solar cell displayed the best photovoltaic properties with a power conversion efficiency of 4.5% at an area of 10 mm² without any additive and annealing treatment. Here, the μ_h value is 10 times higher than that of its TPA based analogue:PC₇₁BM blend. It indicates that the synergistic effect of the TPA-OMe unit in core and fluorine substituents in benzo-thiadiazole is available to improve solubility, mobility and photovoltaic properties of the star-shaped small molecular donors.

研发了三颗TOBTC，TOBTC-1F和TOBTC-2F的星形小分子供体，它们以三（2-甲氧基苯基）胺（TPA-OMe）为电子给体核心，以及非氟，单氟和二氟取代的苯并噻二唑分别作为吸电子分支。与使用TPA作为核心的类似物相比，获得了更高的溶解度和空穴迁移率。更有趣的是，TOBTC-2F：PC ₇₁ BM共混物表现出最高的空穴迁移率（μ _ħ的8.5×10）^-4厘米² V ^-1小号^-1和它的溶液处理的有机太阳能电池与电源显示最好光伏特性在10 mm ²的面积上的转换效率为4.5％无需任何添加剂和退火处理。在此，μ _ħ值比其基于TPA类似物的高10倍：PC ₇₁ BM共混物。这表明TPA-OMe单元在苯并噻二唑的核心和氟取代基中具有协同作用，可用于改善星形小分子供体的溶解度，迁移率和光电性质。